Irrelevant. You chose to refer to people based on their pigmentation levels ('black' and 'white') rather than their background - i.e. culture and nationality (and just now: biological ethnicity). This more or less implies that their pigmentation level (or their biology in general) is a problem in itself; as if one could not expect people with this and that pigmentation level to behave other than so and so.
Look at it this way: if you could only chose between two words to describe Hitler, 'white guy' and 'Nazi', which one would you chose?
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